1c. To calculate the weekly return of each stock and standard deviation of each stock as at end of December 2020.

Date	Open	High	Low	Close	Adj Close	Volume
1/1/2019	5.21	5.29	5.15		55.1093	39001204
1/2/2019	2.90	5.15	4.85		42.20394	59028403
1/3/2019	4.70	4.75	4.41		52.0533	3784500
1/4/2019	3.50	3.60	3.46		53.9032	49019800
1/5/2019	3.44	3.47	3.38		54.2809	23400910
1/6/2019	4.01	4.12	3.72		55.27304	40911092
1/7/2019	3.70	3.88	3.67		43.23055	33901239
1/8/2019	3.50	3.53	3.41		53.20432	09856600
1/9/2019	3.26	3.28	3.15		54.33039	45009600
1/10/2020	3.06	3.16	3.03		43.21022	23990000
1/11/2020	2.95	3.10	2.90		52.33094	44903285
1/12/2020	3.90	4.48	3.85		53.2011	67023653